Dyeing of cellulose derivatives



, No Drawing.

Patented Aug. 16, 1932 UNITED" STATES RATE GEORGE RIVA'I, OF PATIFDRISON, AND ERNEST CADGEN'E, ,OF ENGLEWOOD GLIFFS, NEW

JERSEY, AND OAMILLE DREYFUS, OF NEW YORK, N. Y., ASSIGNORS TO CELANE CORPORATION OF AMERICA, A. CORPORATION OF DELAWARE nurse or CELLULOSE nnnrvarrvns The object of this invention is to provide 9.

Application filed June 30; 1926. Serial No. 119,743.

acid or formic acid was employed as a swellprocess whereby materials made from or coni mg agent.

taining organic derivatives of cellulose may be successfully dyed with mordant dyes. Another object of this invention is to provide a process for efliciently mordanting fabrics or materials consisting of or containing organic esters of cellulose. this invention is to mordant fabrics or other materials consisting of or containing organic esters of cellulose wtith chromium, aluminum,

iron or other salts. A further object of this invention is to provide a process for the dyeing of organic derivatives of cellulose, particularly cellulose "acetate with alizarin or other mordant dyes so that fast and deep shades or colors are obtained. Still another object of this invention is to obtain the improved products resulting from this, invention. Other important objects will be apparentfrom the disclosure in the specification and from the claims.

Heretofore it has been impossible to successfully dye deep colors on fabrics made of organic esters of cellulose with mordant dyes. The usual mordanting processes were found to be ineffective when applied to this class of materials.

We have now discovered a process whereby such fibres can be mordanted successfully and economically. This makes possible'the application of a large class of dyestuffs to the dyeing of such fibres and is therefore a novel and material contribution to the art.

We have discovered that if fibres of organic esters of cellulose are treated with mordanting agents such as iron, aluminum, chromium or other salts in the presence of swelling agents they are successfully mordanted.

Still another object of As illustrative of the applicants process the following examples are given:

Example 1.-A bath was made up containing the following materials in the propertions by weight given:

' Per cent Chromic acetate"; 5to 10 Acetic acid L 10 to 20 Furfurol 3t0 8 Water 62 to 82 The fibre, in yarn, fabric or other form is treated with this mixture for approximately-l hour at 70 C. and then washed. After washin the fibre was dyed with any alizarin color; or instance, Alizar'ine N. A. C. (1:2

dihydroxyanthraquinone, Schultz N0. 778, Color Index No. 1027), for approximately 1 hour at 65 to 7 0 C. whereuponit was found to be evenly and deeply dyed. There was no Example 3. A bath was made of the following: v 4 ,7 4 Per cent Pyrolignite of iron (17 B.) 65 FECIgGHzO Acetic acid 14: Furfurol 5 Water -c- 9 The material to be mdrdanted was worked in this bath for one hour at to 70 C. It was then washed and was found to have taken up approximately 2% of iron. The washed material was then given the usual tendency of the dye to rub and it was exceedingly fast.

Ewample .2.-A bath was made up contain-. ing the following proportions by weight:

Per cent Chromic acetate Acetic acid 18 Furfurol 4 Water 73 logwood treatment, the material being dyed an excellent black.

Example 4.A bath was made up containing the following proportions by weight:

, Percent Aluminum acetate 7.6 Acetic acid Furfurol 4 Water 68.4

y the above examples the dye had formed a lake with the chromium. iron or aluminum and was not merely a direct dyeing of the cellulose acetate; or other organic esters of which the fibre was constituted.

The above examples are in no sense limitative. The compositions of the baths used for mordanting can be varied within appreciable limits. The tinctorial power will vary with the amount of mordant absorbed. Also other salts than those enumerated could be employed as could other swelling agents' Nor isthis application to be construed as limited to alizarin and logwood dyes. Any dye or dyes, natural or artificial which will combine with the mordant can be utilized in this process and are to be considered within the scope of this invention. Instead of mordanting the'fibres with a single salt they may be mordantedwit-h salts of more than one metal or different salts of the same metal.

The material treated in accordonce with this invention results in an excellent product. The treatment as outlined did not cause the organic cellulose derivative to lose any of its distinctive properties or qualities. This invention is applicable to materials whether they consist wholly or partially of organic cellulose derivatives. When a mixed fabric containing an organic derivative of cellulose has been treated in accordance with this invention, the various constitutents of the fabric may be dyed simultaneously. The invention is to be considered as limited only by the scope of the appended claims.

Having described our invention what we claim as new and desire to secure by Letters Patent is:

1. A process of mordanting organic derivatives of cellulose which comprises subjecting such organic derivatives of cellulose to the simultaneous action of mordanting salts which normally do not mordant organic derivatives of cellulose and swelling agents.

2. A process of mordanting organic derivatives of cellulosewhich comprises subjecting such organic derivatives of cellulose to the simultaneous action of a mordanting salt, fur- .furol, and an organic acid which is a swelling agent for the organic derivatives of cellulose treated.

of cellulose which comprises subjecting said esters of cellulose to the simultaneous action of mordanting salts which normally do not mordant organic derivatives of cellulose and swelling agents.

5. A process of mordanting organic esters of cellulose which comprises subjecting the organic esters of cellulose to the simultaneous action of a mordanting salt and furfurol.

6. A process of mordanting organic esters of cellulose whichcomprises subjecting said esters of cellulose to the simultaneous action of a bath containing, a mordanting salt-and 3 to 8% furfurol by weight.

7. A process of mordanting organic esters of cellulose which comprises subjecting said esters to the simultaneous action ofa mordanting salt, furfurol and acetic acid.

8. A process of mordanting organic esters of cellulose which comprises subjecting the organic esters of cellulose to the simultaneous action of a water-soluble chromium salt which normally does not mordant organic esters of of cellulose and a swelling agent.

9. A process of mordanting organic esters of cellulose which comprises subjecting said organic esters of cellulose to the action of an aqueous solution of chromium acetate, furfurol and acetic acid.

10. A process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of mordanting salts which normally do not mordant cellulose acetate and swelling agents.

11. A process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of mordanting salts which normally do not mordant cellulose acetate and swelling agents for approximately one hour.

12. A process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of a mor danting salt and a swelling agent for approximately one hour at to C.

13. A process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of a mor-' dantin salt and furfurol.

14. process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of a mordantin salt and furfurol and acetic acid.

15. process of mordanting cellulose acetate which comprises subjecting the cellulose acetate to the simultaneous action of a watersoluble chromium salt which normally does not mordant cellulose acetate and a swelling agent.

furol and 73% water, the proportions being by weight.

17 A process of treating organic esters of cellulose which comprises subjecting the same to the simultaneous action of a mordanting salt which normally does not mordant organic esters ofcellulose swelling agents, washing the thus treated material and then 7 treating the same in a mordant dye bath.

18. A process of treating organic esters, of

cellulose which comprises subjecting the samq to the simultaneous action of a mordanting salt which normally does not inordant organic esters of cellulose and swelling agents,

washing the thus treated material and then treating the same in a mordant dye bath for 1 approximately on hour at 65 to 70 C.

19. A process of treating cellulose acetate material which comprises subjecting the same to the imultaneous action of a mordantiilg salt which normally does not mordant cel-,

lulose acetate and a swelling-agent, washing the material and then treating the same in a mordant dye bath for approximately 1 hour v at 65 to 70 C.

20. A process of treating cellulose acetate material which comprises subjecting the same I to the simultaneous action of a mordant salt which normally does not mordant cellulose 1 acetate and a swelling agent, washing the same and then treating it in a bath containing an alizarin dye. 1

In testimony whereof, they have hereunto 7 names. GEORGE RIVAT. ERNEST CADGENE.

subscribed their CAMILLE nann es. 

